.travis.yml in amq-protocol-1.7.0 vs .travis.yml in amq-protocol-1.8.0

@@ -12,5 +12,8 @@
   - 1.8.7
   - rbx-18mode
 notifications:
   recipients:
     - [e-mail]
+matrix:
+  allow_failures:
+    - rvm: ruby-head